Derivative Financial Instruments (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized (loss) gain on derivatives	$ (909)	$ 13,960	$ 7,106
Unrealized gain (loss) on derivatives	(7,232)	(4,802)	5,138
Revenues [Member]
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized (loss) gain on derivatives	(909)	13,960	7,106
Unrealized gain (loss) on derivatives	(7,232)	(4,802)	5,138
Total	(8,141)	9,158	12,244
Oil [Member] | Revenues [Member]
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized (loss) gain on derivatives	(2,408)	2,047	0
Unrealized gain (loss) on derivatives	(5,319)	3,673	(554)
Natural Gas [Member] | Revenues [Member]
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized (loss) gain on derivatives	831	11,892	7,106
Unrealized gain (loss) on derivatives	(1,580)	(8,700)	5,692
NGL's [Member] | Revenues [Member]
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized (loss) gain on derivatives	668	21	0
Unrealized gain (loss) on derivatives	$ (333)	$ 225	$ 0